Hello,

You didn't mentioned your school board or stream  but assuming that you are from CBSE. I will  tell you some tips and tricks to score more in your class 12th board.

NCERT is the book which will help you in getting good marks. Go through each and every topic in NCERT Books. Most of the times questions are directly copy pasted from NCERT Books. After you are done with NCERT Book reading and question solving, move onto previous year paper. Solving Previous 5 year papers is enough and will provide you with an idea of what type of questions will come. If you solve the previous 5 year questions carefully and with concentration then half of your work is done.

When you are done with Previous year papers go for Mock/Sample papers. Practising 5 Sample papers is sufficient.

First NCERT thoroughly then previous 5 year question papers then 5 sample papers. If done with concentration and determination is  enough to get you 90% above .

Hope this was helpful.